Carbide gun injuries: two-thirds were severe burns in teenage boys looking into a misfire

Design

Ambispective single-centre case series

Population

37 patients with carbide gun ocular trauma, all male, median age 15, India

Primary outcome

Clinical profile, burn grade and early visual outcome

Effect

Severe burns (Dua IV–VI) 64.8%; BCVA 2.09 to 0.80 logMAR at 1 week; early LSCD in severe burns

An ambispective study in the Indian Journal of Ophthalmology, published on 2 October, describes 37 patients seen at one tertiary eye centre over ten days in October 2025 with injuries from improvised carbide guns — tubes in which calcium carbide and water generate acetylene that is ignited to make a bang.

All were male, with a median age of 15. Every injury happened at home, mostly when the user looked into the device after it failed to fire. The right eye was involved in 89%. Almost two-thirds (64.8%) had severe ocular surface burns, Dua grade IV to VI, often with deep stromal calcium deposits and corneal oedema. Amniotic membrane transplantation was performed early in 81%. Mean acuity improved from 2.09 to 0.80 logMAR at one week and corneal oedema settled, but eyes with severe burns showed early limbal stem cell deficiency by four weeks. Eyelid burns mostly healed with collagen sheets.

The practice change has two parts. For the eye team, severe carbide burns should be graded promptly and considered for early amniotic membrane cover, with planned follow-up for limbal stem cell deficiency. For everyone who sees children and adolescents, the festival season is the time to warn families: the misfire-and-look moment is when most injuries happened. The study had no comparison group, so the benefit attributed to early amniotic membrane transplantation is not proven.

• Irrigate carbide gun eye injuries immediately and remove all particles from the fornices.
• Grade the burn early (Dua classification) and consider early amniotic membrane transplantation for severe grades.
• Arrange follow-up for limbal stem cell deficiency in severe burns; it appeared within four weeks.
• Warn adolescents and parents before the festival season never to look into a carbide gun that has failed to fire.
• Report clusters to local public health authorities; the authors call for controls on calcium carbide sales.

Why it matters

A cheap, social-media-driven device produced an outbreak of potentially blinding burns in children within ten days.

Don't overread it

A single-centre series without a comparison group; it cannot show that early amniotic membrane transplantation improves outcomes.

The statistics, in plain English

logMAR 2.09 is roughly counting fingers; 0.80 is about 6/36. The improvement at one week is early and uncontrolled, and the risk of limbal stem cell deficiency means long-term vision may be worse.

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